Electronic apparatus

ABSTRACT

The present invention provides an electronic apparatus typified by a personal computer for example. The electronic apparatus has: a main unit; and an openable and closable display unit that is attached to the main unit. The main unit has a battery-attachment section to which a detachable battery unit containing a battery for supplying power to the electronic unit is to be attached. The main unit also has projections that are not covered by the display unit when the display unit is closed and are formed at both ends of the attachment section. The projections each contain a speaker.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an electronic apparatus represented bya personal computer for example.

2. Description of the Related Art

In recent years, personal computers (hereinafter sometimes referred toas “PC”) have been in widespread use not only in offices but also athomes. As one type of personal computers, there have been widely knownnotebook personal computers (hereinafter referred to as “notebook PC”)each composed of: a main unit having a keyboard on the top surface; anda display unit openable and closable with respect to the main unit andhaving a display screen. The display unit is opened to stand relative tothe main unit when in use and is folded to lie on the keyboard when notin use.

Also, plate-like tablet personal computers (hereinafter referred to as“tablet PC”) having a display screen on the top surface have emerged inrecent years. A user enters an instruction into this type of PC bybringing a stylus closer to a position on the display screen or touchingthe position with the stylus so as to make the tablet PC recognize theposition.

Also, another type of electronic apparatus capable of operating both asa notebook PC and a tablet PC have come along recently. This type ofapparatus has a main unit and a display unit which are connected via atwo-axis connection section that supports the main unit and the displayunit in such a manner that they can be opened/closed and rotated.

General electronic apparatus such as personal computers are desired tobe smaller in size. Particularly, the above-mentioned notebook PCs,tablet PCs and the like are desired to be smaller and thinner becausethey need to be portable. Lately, as the notebook PCs have become moreand more multifunctional, performance of notebook PCs has almost reachedthe high level comparable to that of desktop PCs. Therefore, it isdesired to realize a smaller and thinner apparatus that also maintainshigh operability while keeping with the trend toward multifunction.

Notebook PCs are usually so configured as to operate on a battery asthey need to be portable. A battery requires a considerably large spaceas compared to other components in a notebook PC, which is a largeobstacle to reduction in size of the notebook PC. With the recentfunctional enhancement, power consumption has also increased, whichrequires a notebook PC to have a larger battery. In addition, personalcomputers are usually equipped with an internal or external speaker.Since quality of sound is also an important factor in realizing ahigh-performance notebook PC, it is required to incorporate aconsiderably large speaker in a notebook PC, which is also a largeobstacle to reduction in size of the notebook PC.

Not only notebook PCs but also various types of devices, such as gamemachines, DVD recorders and players, hard-disk recorders are desired tobe smaller and thinner for the purpose of saving space of aninstallation site.

Japanese Patent Application Publication No. 2003-87378 aims to provide anotebook PC excellent in sound effects by appropriately fixing aspeaker, and proposes to incorporate a speaker in a hinge unit thatconnects a main unit to a display unit in a rotatable manner. Also,Japanese Patent Application Publication No. 2002-182784 proposes anotebook PC having a similar configuration. Further, Japanese PatentApplication Publication No. 2000-148298 proposes the placement of aspeaker, and Japanese Patent Application Publication No. 2003-347759proposes an auxiliary case incorporating a battery.

In order to reduce the size of electronic apparatus such as notebook PC,each component and unit forming an electronic apparatus need to be madesmaller. In addition, how to combine components or units in view ofplacement is also important. All of the above-mentioned Japanese PatentApplication Publications propose the placement of a single component orunit such as a battery or speaker and do not propose size reduction byimproving combinations of components or units. Merely reducing the sizeis not enough and operability as well as design must be taken intoconsideration.

SUMMARY OF THE INVENTION

In view of the foregoing, the present invention provides an electronicapparatus including:

a first enclosure; and

an openable and closable second enclosure that is coupled to the firstenclosure,

wherein the first enclosure includes an attachment section to which adetachable unit is to be attached and also includes projections whichare formed at both ends of the attachment section and are not covered bythe second enclosure when the second enclosure is closed.

In the electronic apparatus, the projections of the first enclosure mayeach include a speaker.

Also, in the electronic apparatus, the detachable unit may be a batteryunit including a battery for supply power to the electronic apparatus.

Further, in the electronic apparatus, in the state in which thedetachable unit is not attached to the attachment section, theprojections may project such that the projections become approximatelyflush with the detachable unit being attached to the attachment section.

Furthermore, in the electronic apparatus, the projections may be formedat both ends of a rear part of the first enclosure behind a positionwhere the second enclosure is coupled.

Still furthermore, in the electronic apparatus, the first enclosure maybe a main unit having a main circuit board and the second enclosure maybe a display unit having a display screen.

As described above, according to the present invention, because aspeaker is disposed at both ends of a battery, even a large battery canbe well housed between speakers. Accordingly, the size can be reduced,the design can be excellent, and the battery can be stably held duringtransportation of equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a notebook PC according to an embodimentof the present invention, showing the front thereof as viewed obliquely;

FIG. 2 is a perspective view of the notebook PC in FIG. 1, showing thefront thereof as viewed obliquely from an angle different from FIG. 1;

FIG. 3 a perspective view of the notebook PC in FIG. 1, showing the backthereof as viewed obliquely;

FIG. 4 is a perspective view of the notebook PC in FIG. 1, showing theback thereof as obliquely viewed from an angle different from FIG. 3;

FIG. 5 is an exploded perspective view of a unit including a CD/DVDdrive and a media slot;

FIG. 6 is a perspective view of the unit shown in FIG. 5 when it isassembled;

FIG. 7 is a cross-sectional view taken along an arrow A-A shown in FIG.6;

FIG. 8 is an enlarged view of the portion in a circle R1 indicated witha chain line shown in FIG. 7;

FIG. 9 is an exploded perspective view of a conventional unit includinga CD/DVD drive and a media slot, shown as an example to be compared withthe present invention;

FIG. 10 is a perspective view of a main unit of the notebook PC shown inFIGS. 1 through 4, as viewed from the reverse side of the top surfacewhere a keyboard is disposed;

FIG. 11 is an enlarged view of the portion in a circle R2 indicated witha chain line shown in FIG. 10;

FIG. 12 is a perspective view of the main unit of the notebook PC shownin FIGS. 1 through 4, as viewed from the top surface where the keyboardis disposed;

FIG. 13 is an enlarged view of the portion in a circle R3 indicated witha chain line shown in FIG. 12;

FIG. 14 is a perspective view of the main unit to mainly show a PC cardremoval operation;

FIG. 15 is an exploded perspective view of the main unit;

FIG. 16 is a plan view of the main unit with a top cover removed;

FIG. 17 is an enlarged view of the portion in a circle R4 indicated witha chain line shown in FIG. 16;

FIG. 18 is a structural perspective view of part of circuit boards andconnectors in the main unit;

FIG. 19 is a plan view of the same elements shown in FIG. 18 before theconnectors are mated with each other;

FIG. 20 is a plan view of the same elements shown in FIGS. 18 and 19when the connectors are mated with each other;

FIG. 21 is an exploded perspective view of the affixing structure offriction members shown in FIG. 1 to be affixed to a back cover of adisplay unit;

FIG. 22 is a perspective view of the friction member when it is disposedon the back cover;

FIG. 23 is an exploded perspective view of the affixing structure of aconventional friction member;

FIG. 24 is a perspective view of the conventional friction member whenit is disposed on a back cover;

FIG. 25 is an external perspective view of the notebook PC when amicrophone is incorporated therein;

FIG. 26 is an enlarged view of the portion in a circle R5 indicated witha chain line shown in FIG. 25;

FIG. 27 is an external perspective view of the notebook PC when aninfrared sensor is incorporated therein instead of the microphone;

FIG. 28 is an enlarged view of the portion in a circle R6 indicated witha chain line shown in FIG. 27;

FIG. 29 is an external perspective view of the notebook PC whose frontcover surrounding the front surface of a display screen of the displayunit is removed;

FIG. 30 is an enlarged view of the portion in a circle R7 indicated witha chain line shown in FIG. 29;

FIG. 31 is a plan view of a circuit board on which an infrared sensor ismounted;

FIG. 32 is a plan view of a microphone unit including a microphone and acircuit board for processing signals picked up by the microphone;

FIG. 33 is a plan view of a circuit board on which a microphone and aninfrared sensor are both mounted; and

FIG. 34 is a plan view of the display unit of the notebook PC.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

An embodiment of the present invention will be described.

1. Appearance

FIGS. 1 through 4 are perspective views of a notebook PC 10 according toan embodiment of the present invention. FIGS. 1 and 2 illustrate thefront of the notebook PC 10 as obliquely viewed from different angles,and FIGS. 3 and 4 illustrate the back of the notebook PC 10 as obliquelyviewed from different angles.

The notebook PC 10 is composed of two cabinets: a main unit 20 and adisplay unit 30. The display unit 30 is supported by a hinge section 40so that it can be opened and closed with respect to the main unit 20.

The main unit 20 has a keyboard 21, a trackpad 22, etc. on its topsurface and also has an insertion opening 231 of a PC card slot, whichaccesses a PC card removably inserted thereinto as will be describedlater, on the left flank. On the front surface of the main unit 20,there is disposed an operation member 232 to be slidably operated forremoving a PC card inserted into the PC card slot. Inside the cabinet ofthe main unit 20, there is a main circuit board on which circuits suchas a CPU for performing various processing and other components aremounted. Also, part of the right flank of the main unit 20 is formed byan end surface 241 of a CD/DVD drive for accessing a removable CD or DVDinserted and rotated therein, which will also be described later. Theend surface 241 has an eject button 242 that causes a tray of the CD/DVDdrive to slide out from the main unit 20 when pressed.

The right flank of the main unit 20 has an insertion opening 251 of amedia slot for accessing various types of removable recording media(SmartMedia(TM), xD-card(TM), etc.) inserted therein. The insertionopening 251 is so formed as to vertically overlap the CD/DVD drive.

When the display unit 30 is closed with respect to the main unit 20, theexternal form of the main unit 20 covered by the display unit 30 isnearly a rectangular solid.

The display unit 30 has a large-sized display screen 31 and a frontcover surrounding the display screen 31 on its front. On the frontcover, there is formed a hole 32 for leading sound to a microphone (notshown) disposed inside the display unit 30.

The hinge section 40 is so configured as to support the display unit 30in such a manner that the display unit 30 is openable and closable withrespect to the main unit 20.

The display unit 30 needs to be rotatable with respect to the main unit20 and at the same time, it must be capable of remaining in any positionwhen the display unit 30 is open with respect to the main unit 20. Forthis purpose, the display unit 30 has friction members 41. The frictionmembers 41 serve to apply friction to rotation shafts 33 of the displayunit 30 so that the display unit 30 can remain in any position when thedisplay unit 30 is open with respect to the main unit 20.

Behind the hinge section 40, there are disposed speakers 26 in the rightand left of the rear part of the main unit 20. To an area between thesetwo speakers 26, a battery unit 27 containing a battery for supplyingpower to components of the notebook PC 10 is removably attached. Therear-end surface of the battery unit 27 is nearly flush with portions ofthe cabinet of the main unit 20 that support the speakers 26.

2. CD/DVD Drive and Media Slot

FIG. 5 is an exploded perspective view of a unit 50 including the CD/DVDdrive and the media slot according to the embodiment. FIG. 6 is aperspective view of the unit 50 shown in FIG. 5 when it is assembled.FIG. 7 is a cross-sectional view taken along an arrow A-A shown in FIG.6. FIG. 8 is an enlarged view of the portion in a circle R1 indicatedwith a chain line shown in FIG. 7.

Also, FIG. 9 is an exploded perspective view of a conventional unit 500including a CD/DVD drive and a media slot, which is shown as an exampleto be compared with the present embodiment.

The example shown in FIG. 9 will be described first.

The unit 500 is composed of a base plate 501, a CD/DVD drive 502, amotherboard 503, a chassis 504, and a media unit 505. The media unit 505has a media slot 5051, a CF card slot 5052, and a PC card slot 5053 aremounted thereon.

The unit 500 is assembled in such a manner that the CD/DVD drive 502 andthe motherboard 503 are mounted on the base plate 501, the chassis 504is mounted on the CD/DVD drive 502, and then the media unit 505 ismounted on the chassis 504. In this case, the thickness of a portion,which includes the mounted CD/DVD drive 502, of the unit 500 is equal tothe sum of the thicknesses of the base plate 501, CD/DVD drive 502,chassis 504, and media unit 505. Here, attention is focused on the mediaslot 5051 mounted on the media unit 505, and the total thickness of theportion including the mounted media slot 5051 is determined withconsideration given to the thickness of the media slot 5051 instead ofthe thickness of the media unit 505.

Now, the present embodiment will be described with reference to FIGS. 5through 8.

The unit 50 shown in FIG. 5 is composed of a base plate 51, a CD/DVDdrive 24, a media slot 52, a mounting fitting 53, and a circuit board54.

As shown in FIG. 7, the CD/DVD drive 24 has a double-layer cabinetcomposed of a first rectangular portion 24a and a second rectangularportion 24b formed thereon, which both extend laterally. The secondrectangular portion 24b is shorter than the first rectangular portion24a in the lateral direction, and the one end (the left side in FIG. 7)of the second rectangular portion 24b in the lateral direction isaligned with that of the first rectangular portion 24 a. Disposed insidethe first rectangular portion 24 a is a medium loading section intowhich a CD or DVD is loaded. In contrast, disposed inside the secondrectangular portion 24 b is a medium driving section for driving a CD orDVD loaded into the medium loading section. The medium loading sectionhas a tray for holding a CD or DVD and ejects the tray upon depressionof the eject button 242. When the tray retracts, the medium drivingsection accesses a CD or DVD on the tray by driving it. A sidewall ofthe CD/DVD drive 24 is approximately L-shaped due to the medium loadingsection and the medium driving section. A panel forming the end surface241 of the tray is also approximately L-shaped conforming to the L shapeof the sidewall.

The CD/DVD drive 24 alone becomes a unit by itself that can be removablyinserted into a housing section of the unit 50 when the unit 50 isassembled (when the notebook PC 10 is assembled). An end of the CD/DVDdrive 24 is provided with an opposite connector to be mated with aconnector (not shown) of the circuit board 54 when the CD/DVD drive 24is inserted into the housing section of the unit 50.

The media slot 52 is a drive for accessing a storage medium insertedthrough the insertion opening 251. As shown in FIG. 8, the media slot 52is disposed in a position where it vertically overlaps the firstrectangular portion 24 a and is laterally aligned with the secondrectangular portion 24 b. Therefore, it is possible to utilize a dentformed by the first and second rectangular portions 24 a and 24 b—i.e.space formed in a rectangular area surrounding the first and secondrectangular portions 24 a and 24 b. Such space-saving reduces the totalthickness of the notebook PC 10 as compared with the example shown inFIG. 9, thereby helping to make the notebook PC 10 small and slim.

3. Battery Unit and Speaker

FIG. 10 is a perspective view of the main unit 20 of the notebook PC 10shown in FIGS. 1 through 4, as viewed from the reverse side of the topsurface where the keyboard 21 is disposed. FIG. 11 is an enlarged viewof the portion in a circle R2 indicated with a chain line shown in FIG.10. FIG. 12 is a perspective view of the main unit 20 of the notebook PC10 shown in FIGS. 1 through 4, as viewed from the top surface where thekeyboard 21 is disposed. FIG. 13 is an enlarged view of the portion in acircle R3 indicated with a chain line shown in FIG. 12. FIGS. 10 and 12also show the battery unit 27 detached from the main unit 20. FIG. 11shows the bottom surface of a speaker-supporting portion of the cabinetforming the main unit 20, which is in the battery-attachment sectionside. FIG. 13 shows an end surface of the battery unit 27, which is tobe attached to the main unit 20.

As mentioned above, behind the hinge section 40, the battery-attachmentsection 271 is formed, to which the battery unit 27 used for supplyingpower to components of the notebook PC 10 is removably attached. Theexternal form of the battery unit 27 is nearly a rectangular solid andhas a connector that is at least provided with a power terminal at oneend in the longitudinal direction. Inside the case of the battery unit27, there are two or more battery cells wired to the connector. When thebattery unit 27 is slid into the battery-attachment section 271 from theback of the main unit 20, the connectors of the both sides are matedwith each other. The battery unit 27 is attached to the main unit 20 inthis manner. Also, at both ends of the battery-attachment section 271,the speakers 26 are disposed to output sound to the outside.

The portions of the cabinet forming the main unit 20 that support thespeakers 26 are so formed as to project towards the back of the mainunit 20. These portions project such that the projections become nearlyflush with the battery unit 27 when the battery unit 27 is attached tothe battery-attachment section 271. In the state that the battery unit27 is attached to the battery-attachment section 271, the portions ofthe cabinet forming the main unit 20 that support the speakers 26 areapproximately flush with the battery unit 27. In other words, theportions of the cabinet forming the main unit 20 that support thespeakers 26 are not covered by the display unit 30 when it is closed tolie on the main unit 20.

A conventional battery unit is attached to a main unit in such a mannerthat the battery unit alone projects from the cabinet of the mainunit-i.e. only about half of the battery unit is attached to the mainunit. Therefore, a user often feels that it is unstable. Further, aconventional battery unit is liable to damage during transportation whenthe connection point between the connectors of the main unit and thebattery unit is put under the load of the weight of the battery unit, orwhen the battery unit hits something. However, according to the presentembodiment, the portions of the cabinet forming the main unit 20 thatsupport the speakers 26 project such that the projections become flushwith the battery unit 27 when the battery unit 27 is attached to thebattery-attachment section 271. Therefore, the stability of the batteryunit 27 in an attachment position has been improved. Also, such astructure prevents a load of the weight of the battery unit on theconnection point between the connectors of the main unit and the batteryunit.

At each end of the battery unit 27, a long groove 273 is formed (seeFIG. 13). Each long groove 273 is engaged with corresponding one ofprojections 272 (see FIG. 11) that are each formed on a sidewall, whichfaces the battery-attachment section 271, of the portion having thespeaker 26 disposed thereon of the cabinet forming the main unit 20. Thelong groove 273 extends for almost the entire width of the battery unit.Therefore, the battery unit 27 is not only stable but also firmlysupported by the main unit 20. In addition, the entire long groove 273(nearly equals to the entire width of the battery unit 27) supports thebattery unit 27, which helps eliminate a load to be applied to theconnectors by the weight of the battery unit 27.

Further, as shown in FIG. 11, each of the projections 272 to be engagedin the corresponding long groove 273 of the battery unit 27 is composedof two portions 272 a and 272 b. When removing the battery unit 27inserted into the battery-attachment section 271 therefrom, twooperation members 274 shown in FIG. 10 ate slid to retract claws (notshown) engaged with the projections 272 into the battery unit 27.Because each of the projections 272 is composed of the two portions 272a and 272 b and each of the claws is urged by a spring (not shown) toprotrude from the battery unit 27, once the claw is retracted forremoving the battery unit 27, the claw enters between the portions 272 aand 272 b after going over the portion 272 b and is stopped by theportion 272 a. This prevents the battery unit 27 from being pulled outwhen it remains in this state. When the operation members 274 areoperated again to retract the claws, the battery unit 27 can be pulledand finally removed from the battery-attachment section 271. Thestructure requiring such a two-step removal operation can preventaccidents such as sudden detachment or drop of the battery unit 27 thatmay occur when the battery unit 27 is removed.

4. Card Ejection Mechanism

FIG. 14 is a perspective view of the main unit 20 to mainly show a PCcard removal operation. FIG. 15 is an exploded perspective view of themain unit 20. FIG. 16 is a plan view of the main unit 20 with its topcover removed. FIG. 17 is an enlarged view of the portion in a circle R4indicated with a chain line shown in FIG. 16.

FIG. 14 also shows the insertion opening 231 of the PC card slot and theoperation member 232 to be slidably operated for removing a PC cardinserted into the PC card slot. When the operation member 232 is slid inthe direction of an arrow A shown in FIG. 14 in a state where a PC cardis inserted into the PC card slot, part of the PC card projects from theinsertion opening 231 in the direction of an arrow B. By holding andpulling the projecting part with fingers, the PC card can be removedfrom the PC card slot.

As shown in FIG. 15, the main unit 20 can be disassembled into a bottomcover 201 on which various components including the PC card slot 23 andthe like are mounted; the keyboard 21; and the top cover 202 to coverthe keyboard 21 mounted on the bottom cover 201. FIG. 15 also shows anejection mechanism section composed of the operation member 232 and asliding fitting 233 to engage the operation member 232, which are notassembled.

The bottom cover 201 has an indentation 201 a and the top cover 202 alsohas an indentation 202 a in a position corresponding to the indentation201 a. When the bottom cover 201 and the top cover 202 are assembled, anopening defined by the indentations 201 a and 202 a is formed to connectthe inside and outside of the main unit 20.

The operation member 232 has a projecting engagement claw 232 a and isdisposed on the surface of a cover formed by the bottom and top covers201 and 202. The engagement claw 232 a projects towards the inside ofthe cover through the opening defined by the indentations 201a and 202a. In contrast, the sliding fitting 233 is disposed inside the cover andhas an engagement hole 233 a through which the engagement claw 232 a ofthe operation member 232 projecting towards the inside of the cover isinserted. When the operation member 232 is slid, the sliding fitting 233is also slid together with the operation member 232 along an inner wallof the cover.

The sliding fitting 233 has been bent into an L-shape in cross section.One surface 233 b of the sliding fitting 233 can be disposed so as tocontact an inner surface of the cover, and a top plate as the othersurface 233 c has a slit 233 e through which a screw 234 can beinserted. The screw 234 is inserted into and secured to a screw hole 235formed in the center of a boss standing on the bottom cover 201. Thesliding fitting 233 is engaged with and supported by the operationmember 232, and is further guided by the screw 234 screw-fitted throughthe long hold 232 e. Therefore, according to a sliding operation made onthe operation member 232, by the guide of the slit 233 e, the slidingfitting 233 can be slid together with the operation member 232 in thedirection in which an L-shaped ridge 233 d of the operation member 232extends.

As shown in FIG. 17, the PC card slot 23 has a medium eject lever 236.When a PC card (not shown) is inserted into the PC card slot 23 throughthe insertion opening 231, the medium eject lever 236 is moved by theinserted PC card to a medium insert position indicated with a solid lineshown in FIG. 17. When the operation member 232 is slid in the directionof an arrow A shown in FIG. 14, the sliding fitting 233 is slid togetherwith the operation member 232, pushing the medium eject lever 236 untilit reaches a medium eject position indicated with a chain line shown inFIG. 17. While moving from the medium insert position indicated with thesolid line shown in FIG. 17 to the medium eject position indicated withthe chain line shown in FIG. 17, inside the PC card slot 23, the mediumeject lever 236 pushes the PC card inserted into the PC card slot 23 inthe direction of an arrow B shown in FIG. 14 to a position where part ofthe PC card projects from the PC card slot 23 so that the projectingpart of the PC card can be held and pulled by fingers. The presentembodiment employs the sliding fitting 233 bent into the shape of an Land is so configured as to sandwich a wall of the cover of the main unit20 between the operation member 232 and the sliding fitting 233.Therefore, the walls of the bottom cover 201 and the top cover 202 areused only as a guide for sliding movements and their strength is notused, which enables the cover to be made of thin material, therebycontributing to the size and weight reduction of the notebook PC 10.

Also, the present embodiment is so configured as to move the slidingfitting 233 while preventing its vertical movements by means of thescrew 234 in the inside of the cover of the main unit 20. Therefore, theoperation member 232 supporting the sliding fitting 233 can be welloperated without having a frame for the operation member 232 surroundingthe range of movement of the operation member 232. Because there is noneed to provide such a frame, the present embodiment can reduce thespace by the width of the frame, which contributes to the size reductionof the notebook PC 10.

5. Structure of Connector Section

FIG. 18 is a structural perspective view of part of circuit boards andconnectors in the main unit. FIG. 19 is a plan view of the same elementsshown in FIG. 18 before the connectors are mated with each other. FIG.20 is a plan view of the same elements shown in FIGS. 18 and 19 when theconnectors are mated with each other.

FIG. 18 illustrates a board assembly 61 and a main board 62. The boardassembly 61 is composed of two circuit boards 611 and 612 fixed to eachother with a predetermined space between them. Of the circuit boards 611and 612, the circuit board 612 has a connector 63 disposed on a surfacefacing the circuit board 611 at a position closed to one side of thecircuit board 612. The connector 63 is so configured as to be mated witha connector 65 connected to one end of a cable 64. Through theseconnectors 63 and 65, signals are exchanged between a circuit on thesecircuit boards and a circuit component (not shown) to which the otherend of the cable 64 is connected. The board assembly 61 is fixed to themain board 62 in such a manner that a predetermined space is formedbetween the board assembly 61 and the main board 62 and that the circuitboard 612 having the connector 63 mounted thereon is disposed in themain board 62 side.

Of the circuit boards 611 and 612, the upper circuit board 611 has anindentation 611 a for visually observing the connector 63 at a positionfacing the connector 63 mounted on the lower circuit board 612. Withoutthe indentation 611 a, it is extremely hard for a user to observe theconnector 63 and thus mating of the connectors 63 and 65 must be carriedout with guesswork when the board assembly 61 is fixed to the main board62, which reduces working efficiency to a great extent. On the contrary,because the indentation 611 a is formed in the circuit board 611, a usercan observe the connector 63, which remarkably improves workingefficiency during mating of the connectors 63 and 65.

6. Affixing Structure of Friction Members

FIG. 21 is an exploded perspective view of the affixing structure of thefriction members 41 shown in FIG. 1 to be affixed to the back cover ofthe display unit 30, and FIG. 22 is a perspective view of the frictionmember 41 when it is disposed on the back cover.

Also, FIG. 23 is an exploded perspective view of the affixing structureof a conventional friction member, and FIG. 24 is a perspective view ofthe conventional friction member when it is disposed on a back cover.

FIGS. 21 and 22 illustrate the structure employed by the notebook PC 10shown in FIGS. 1 through 4 as an embodiment, and FIGS. 23 and 24illustrate a conventional example for comparison.

The example shown in FIGS. 23 and 24 will be described first.

A back cover 1301 forming a display unit has an indentation 1301 a thatdefines an opening formed when the back cover 1301 is covered by a frontcover (not shown) that enables a display screen to be seen. A frictionmember 1041 is so disposed to extend linking the outside and inside ofthe back cover 1301 through the indentation 1301 a. The friction member1041 enters the inside of the back cover 1301 from the indentation 1301a and has two arms 1041 a and 1041b spreading at both ends. The arms1041 a and 1041 b have through holes 1041 c and 1041 d, respectively. Incontrast, the back cover 1301 has bosses 1301 b and 1301 c over whichthe through holes 1041 c and 1041 d of the arms 1041 a and 1041 b are tobe aligned. The bosses 1301 b and 1301 c have screw holes 1301 d and1301 e formed in the center, respectively. The two arms 1041 a and 1041b are positioned on the bosses 1301 b and 1301 c and screwed by usingthe through holes 1041 c and 1041 d and the screw holes 1301 d and 1301e. In this way, the friction member 1041 is fixed to the back cover1301. In the example shown in FIGS. 23 and 24, the affixing structure ofthis example can be employed because the back cover 1301 has sufficientspace in the x direction shown in FIG. 24. However, when space is tightin the x direction, for example when a large display module is mounted,the size of the back cover 1301 needs to be increased only for thepurpose of such mounting, which contradicts the demand for sizereduction of equipment.

Next, the embodiment shown in FIGS. 21 and 22 will be described.

The friction member 41 shown in FIGS. 21 and 22 is fixed inside a backcover 301 of the display unit 30 (see FIG. 1) and extends towards theoutside of the back cover 301 through an indentation 301 a that definesan opening formed when the back cover 301 is covered by a front cover(not shown).

A part of the friction member 41 entering the inside of the back cover301 through the indentation 301 a is composed of a fist arm 411 and asecond arm 412. The first arm 411 enters the inside of the back cover301 through the indentation 301 a and extends along an inner wall of theback cover 301 in the left direction in FIGS. 21 and 22. The second arm412 enters the inside of the back cover 301 through the indentation 301a and extends along an inner wall of the back cover 301 in the rightdirection in FIGS. 21 and 22.

The back cover 301 has an engagement projection 301 b in a portion wherethe first arm 411 extends, which projects towards the inside of the backcover 301. The first arm 411 of the friction member 41 has an engagementindentation 411 a to be engaged with the engagement projection 301 b ina position corresponding to the engagement projection 301 b. As shown inFIG. 22, when the friction member 41 is disposed on the back cover 301,the engagement projection 301 b of the back cover 301 is engaged in theengagement indentation 411 a formed in the first arm 411 of the frictionmember 41.

In contrast, the second arm 412 of the friction member 41 extendingalong an inner wall of the back cover 301 is bent into a 90 degreeangle, and the bent part has two through holes 412 a and 412 b and alocating hole 412 c in the center between the two through holes 412 aand 412 b.

The back cover 301 has two bosses 301 c and 301 d formed at positionswhere the two through holes 412 a and 412 b of the second arm 412 of thefriction member 41 are to be placed. The bosses 301 c and 301 d havescrew holes 301 f and 301 g in the center, respectively. In the centerbetween the bosses 301 c and 301 d, there is formed a standing pin 301 eto be inserted into the locating hole 412 c formed in the second arm 412of the friction member 41.

In order to fix the friction member 41 to the back cover 301, as shownin FIG. 22, the engagement projection 301 b of the back cover 301 isengaged in the indentation 411 a of the first arm 411 of the frictionmember 41, and the pin 301 e of the back cover 301 is inserted into thelocating hole 412 c of the second arm 412. Then, the two through holes412 a and 412 b of the second arm 412 are aligned with the screw holes301 f and 301 g of the bosses 301 c and 301 d. In this state, thefriction member 41 is screwed on the back cover 301 by using the throughholes 412 a and 412 b and the screw holes 301 f and 301 g.

Of the two arms 411 and 412, the one arm 411 is fixed only by engagementand the other arm 412 is fixed by screws and the like in theabove-described structure. Accordingly, even when space is tight in thex direction of the back cover 301 shown in FIG. 22, if there is openspace in the y direction, it is possible to adopt a flexible affixingstructure such as extending an arm to the open space and affixing itthere as in the present embodiment.

7. Microphone and Infrared Sensor (Part 1)

As mentioned above, the notebook PC 10 (see FIG. 1) of the presentembodiment has a microphone inside the front cover surrounding thedisplay screen 31 of the display unit 30. The front cover has the hole32 for leading sound to a microphone (not shown) disposed insidethereof. However, the notebook PC 10 of the present embodiment has sucha structure that it is capable of containing an infrared sensor forremote-controlling the notebook PC 10 with infrared signals disposedbehind the hole 31 instead of a microphone. Both of amicrophone-containing structure and an infrared-sensor-containingstructure will be described below.

FIG. 25 is an external perspective view of the notebook PC when amicrophone is incorporated therein, and FIG. 26 is an enlarged view ofthe portion in a circle R5 indicated with a chain line shown in FIG. 25.

FIG. 25 illustrates, as also shown in FIGS. 1 and 2, the front cover ofthe display unit 30 has the hole 32 for leading sound to a microphonedisposed inside. Incidentally, the hole 32 is formed in a hollow whoseshape is approximately equal to the external form of an optical filter35 as will be described later and whose depth is equal to the thicknessof the optical filter 35.

FIG. 27 is an external perspective view of the notebook PC when aninfrared sensor is incorporated therein instead of the microphone, andFIG. 28 is an enlarged view of the portion in a circle R6 indicated witha chain line shown in FIG. 27.

The optical filter 35 for cutting visible light and transmittinginfrared rays is affixed on the hole 32 (see FIGS. 25 and 26). When theoptical filter 35 is affixed in the above-described hollow, the frontsurface of the optical filter 35 is approximately flush with the surfaceof the front cover of the display unit 30 due to the depth of thehollow, thus providing an excellent design. In addition, the hole 32shown in FIGS. 25 and 26 becomes invisible when the optical filter 35 isaffixed, which prevents dust from entering. The optical filter 35transmits infrared rays to enable the infrared sensor disposed insidethereof to properly receive infrared signals from a remote controller,and cuts visible light to reduce noise.

FIG. 29 is an external perspective view of the notebook PC 10 whosefront cover surrounding the front surface of the display screen 31 ofthe display unit 30 is removed. FIG. 30 is an enlarged view of theportion in a circle R7 indicated with a chain line shown in FIG. 29.FIG. 31 is a plan view of a circuit board on which an infrared sensor ismounted. FIG. 32 is a plan view of a microphone unit including amicrophone and a circuit board for processing signals picked up by themicrophone.

On a circuit board 71, there is mounted an infrared sensor 72 thatreceives infrared signals used for remote control as shown in FIG. 31.The circuit board 71 is screwed on a position shown in FIGS. 29 and 30of the display unit 30. At this point, the infrared sensor 72 ispositioned behind the hole 32 shown in FIGS. 25 and 26 and receivesinfrared signals passing through the optical filter 35 (see FIGS. 27 and28) and the hole 32 (see FIGS. 25 and 26). Signals received by theinfrared sensor 72 are processed by a circuit on the circuit board 71and the notebook PC operates according to the received signals.

When a microphone is disposed behind the hole 32 shown in FIGS. 25 and26, there are used a microphone unit 74 having a microphone 73 and acircuit board 76 having thereon a circuit for processing signalsreceived by the microphone 73. The microphone unit 74 has a locatinghole 75 into which a dowel 36 (see FIG. 30) formed on the display unit30 is to be inserted. When the microphone unit 74 is positioned in sucha manner that the dowel 36 enters the hole 75, the microphone 73 comesto a position just behind the hole 32 shown in FIGS. 25 and 26. Themicrophone 73 and the circuit board 76 are connected with a cable (notshown), and the circuit board 76 is screwed in a position right belowthe microphone unit 74.

Whether to contain a microphone or an infrared sensor is selecteddepending on the destination either of domestic or overseas at the timethe notebook PC is assembled. However, such selection may be madedepending on the grade of the notebook PC instead of the destination.

As described above, the present embodiment is so configured as todispose either one of two or more types of components (microphone andinfrared sensor in the embodiment) that interact with the outsidethrough the same hole 32 in different manners. Accordingly, there is noneed to provide an additional hole, which makes the notebook PCexcellent in design.

In addition, because the hole 32 is formed in the front cover of thedisplay unit 30, the hole 32 is in a higher position when the displayunit 30 is opened, thereby providing excellent sound-collecting effectof the microphone as well as excellent receiver sensitivity of theinfrared sensor.

8. Microphone and Infrared Sensor (Part 2)

Next, there will be described another arrangement of microphone andinfrared sensor, which can be employed instead of the arrangement ofmicrophone and infrared sensor described with reference to FIGS. 25through 32.

FIG. 33 is a plan view of a circuit board on which a microphone and aninfrared sensor are both mounted. Parts (A) and (B) of FIG. 33illustrate the same circuit board opposite in the vertical direction.

In the center of a circuit board 80, a magnetic sensor 81 for detectingcontact and non-contact of a magnetic member is disposed. In addition, amicrophone 82 is disposed at one end of the circuit board 80, whereas aninfrared sensor 83 for receiving infrared signals used for remotecontrol is disposed at the other end of the circuit board 80. Further,the circuit board 80 has two through holes 84 and 85 for screwing thecircuit board 80, which are formed between the magnetic sensor 81 andthe microphone 82 and between the magnetic sensor 81 and the infraredsensor 83, respectively. When the circuit board 80 is rotated 180degrees about the magnetic sensor 81, the through holes 84 and 85 changeplaces so that the magnetic sensor 81 can be screwed in the sameposition. At this time, the microphone 82 and the infrared sensor 83also change places.

FIG. 34 is a plan view of the display unit 30 of the notebook PC. Part(A) of FIG. 34 illustrates the display unit 30 in a state when the frontcover surrounding the display unit 31 is removed, and Part (B) of FIG.34 illustrates the display unit 30 in a state when the front cover isfixed thereto.

The back cover of the display unit 30 has two screw holes 38 and 39 forfixing the circuit board 80. Fixing is made by aligning these two screwholes 38 and 39 with the two through holes 84 and 85 of the circuitboard 80 and screwing by using these holes. With this arrangement, themagnetic sensor 81 can be disposed in the same position irrespective ofthe orientation of the circuit board 80, and the microphone 82 or theinfrared sensor 83 can be disposed behind the hole 32 depending on theorientation of the circuit board 80. When the circuit board 80 isscrewed in the direction in which the infrared sensor 83 is disposedbehind the hole 32, an optical filter for transmitting infrared rays andcutting visible light is affixed on the hole 32. On the main unit 20(see FIGS. 1 and 2) of this notebook PC, a magnetic member (not shown)is disposed in a position corresponding to the magnetic sensor 81 on thecircuit board 80. When the display unit 30 is closed to lie on the mainunit 20, the magnetic sensor 81 detects the magnetic member and the mainunit 20 recognizes the fact that the display unit 30 is closed. When thedisplay unit 30 is opened with respect to the main unit 20, the magneticsensor 81 does not detect the magnetic member and the main unit 20recognizes the fact that the display unit 30 is opened. Such recognitionof opening and closing is utilized for power supply to the notebook PC,mode switching, etc.

Only either one of the microphone 82 and the infrared sensor 83 is usedfor one notebook PC according to the orientation of the circuit board80.

According to the arrangement described with reference to FIGS. 33 and34, the same circuit board can be used irrespective of destination andgrade, which can reduce the number of components to be controlled andcan reduce costs by sharing a component. In addition, such anarrangement is excellent in design as compared with a case where twoholes are formed for a microphone and an infrared sensor in spite of thefact that only one hole is used.

1. An electronic apparatus comprising: a first enclosure; and anopenable and closable second enclosure that is coupled to the firstenclosure, wherein the first enclosure includes an attachment section towhich a detachable unit is to be attached and also includes projectionswhich are formed at both ends of the attachment section and are notcovered by the second enclosure in the case where the second enclosureis closed.
 2. An electronic apparatus according to claim 1 wherein theprojections of the first enclosure each include a speaker.
 3. Anelectronic apparatus according to claim 1 wherein the detachable unit isa battery unit including a battery for supply power to the electronicapparatus.
 4. An electronic apparatus according to claim 1 wherein, inthe state in which the detachable unit is not attached to the attachmentsection, the projections project such that the projections becomeapproximately flush with the detachable unit being attached to theattachment section.
 5. An electronic apparatus according to claim 1wherein the projections are formed at both ends of a rear part of thefirst enclosure behind a position where the second enclosure is coupled.6. An electronic apparatus according to claim 1 wherein the firstenclosure is a main unit having a main circuit board and the secondenclosure is a display unit having a display screen.